#1 Brock Lesnar
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Despite showing some flashes of greatness – in particular, his win over Frank Mir at UFC 100 – nobody comes close to Brock Lesnar when it comes to being overrated in his UFC run.
Lesnar did win the UFC Heavyweight title, granted, and he did make two successful title defences. But he was always a hugely flawed fighter, only pushed to the level he was due to his WWE background, and once he fought better opponents he was painfully exposed.
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Lesnar debuted in an exciting fight with Mir that saw him submitted in the first round, but he bounced back and defeated Heath Herring, and from there the UFC brass decided to grant him a title shot against the returning Randy Couture.
Lesnar KO’d Couture to win the belt and then defeated Mir, but even at that point, there were huge question marks around him.
The UFC were pushing Lesnar as ‘the baddest man on the planet’ by that point, but a bout of diverticulitis kept him out for a year.
Upon his return, he was almost knocked out by Shane Carwin before Carwin gassed and gave up an arm triangle and finally, Cain Velasquez dethroned him in shockingly easy fashion.
Another bout of diverticulitis then kept him out for another year before a loss to the debuting Alistair Overeem finally forced him into retirement.
In both of his losses, he showed a poor chin and stunningly weak defense against striking, belying that claim that he was the world’s top heavyweight.
In essence, Lesnar came in, was pushed to the top based on his out-of-cage reputation, won a couple of big fights and was then gone once he lost to top competition.
Ignoring his steroid-fuelled 2016 return to the Octagon, he remains the most overrated fighter in UFC history.